Table 1 Baseline Characteristics by trajectory and growth Rrate for 485 children in the Hong Kong “Children of 1997” birth cohort
Characteristics | Trajectory | Mean Growth Rate (SD) | |||||
|---|---|---|---|---|---|---|---|
I | II | III | IV | V | 0–3 | 3–12 | |
(n = 81) | (n = 114) | (n = 102) | (n = 100) | (n = 88) | Months | Months | |
Erupted permanent tooth number; mean (SD) | 26.3(2.0) | 25.8(3.0) | 26.3(2.7) | 26.4(2.4) | 26.6(1.9) | ||
Complete emergencea | |||||||
Yes | 43.2 | 43.0 | 54.9 | 47.0 | 51.1 | 0.11 (0.91)* | 0.02 (0.77) |
No | 56.8 | 57.0 | 45.1 | 53.0 | 48.9 | 0.37 (0.85)* | − 0.08 (0.64) |
Gendera | |||||||
Female | 61.7 | 51.8 | 45.1 | 52.0 | 42.0 | 0.27 (0.89) | 0.03 (0.63) |
Male | 38.3 | 48.2 | 54.9 | 48.0 | 58.0 | 0.33 (0.95) | −0.04 (0.79) |
Weight for age z-score; mean (SD) | |||||||
Birth* | −0.70 (0.99) | − 0.66 (0.75) | − 0.19 (0.64) | 0.24 (0.63) | 0.51 (0.90) | ||
3 months* | −0.92 (0.57) | −0.40 (0.38) | 0.40 (0.67) | 0.31 (0.40) | 1.06 (0.64) | ||
12 months* | −1.14 (0.50) | −0.31 (0.44) | 0.52 (0.33) | 0.02 (0.35) | 1.19 (0.67) | ||
Gestational age (weeks)a | |||||||
37* | 14.8 | 9.6 | 11.8 | 2.0 | 1.1 | 0.83 (0.98) | 0.04 (0.70) |
38* | 19.8 | 27.2 | 25.5 | 15.0 | 22.7 | 0.38 (1.00) | 0.14 (0.79) |
39* | 38.3 | 29.8 | 29.4 | 29.0 | 23.9 | 0.21 (0.82) | −0.05 (0.65) |
40* | 14.8 | 26.3 | 24.5 | 34.0 | 29.5 | 0.22 (0.82) | −0.20 (0.62) |
≥ 41* | 12.3 | 7.0 | 8.8 | 20.0 | 22.7 | −0.16 (0.71) | 0.01 (0.74) |
Mode of deliverya | |||||||
Natural labour | 56.8 | 55.3 | 42.2 | 57.0 | 55.7 | 0.29 (0.89) | −0.07 (0.65) |
Assisted natural labour | 16.0 | 16.7 | 30.4 | 17.2 | 21.6 | 0.17 (0.98) | 0.13 (0.81) |
Caesarean birth | 23.5 | 24.6 | 23.5 | 25.0 | 19.3 | 0.42 (0.92) | −0.01 (0.74) |
Unknown | 3.7 | 3.5 | 3.9 | 1.0 | 3.4 | 0.36 (0.92) | 0.19 (0.74) |
With congenital conditionsa | |||||||
Yes | 2.5 | 0.0 | 0.0 | 3.0 | 0.0 | −0.96 (0.50)* | 0.12 (0.53) |
No | 97.5 | 100.0 | 100.0 | 97.0 | 100.0 | 0.31 (0.92)* | −0.01 (0.71) |
Type of feedinga | |||||||
Never breastfed | 56.8 | 56.1 | 49.0 | 53.0 | 56.8 | 0.25 (0.81) | −0.02 (0.67)* |
Exclusively breastfed 3 months or partially breastfed | 28.4 | 36.0 | 40.2 | 39.0 | 37.5 | 0.36 (1.09) | 0.04 (0.75)* |
Exclusively breastfed for 3 months or more | 13.6 | 6.1 | 7.8 | 8.0 | 4.5 | 0.51 (0.78) | −0.25 (0.80)* |
Unknown | 1.2 | 1.8 | 2.9 | 0 | 1.1 | −0.03 (0.88) | 0.43 (0.52)* |
Highest parental educationa | |||||||
≤ 9th grade | 33.3 | 35.1 | 24.5 | 32.0 | 29.5 | 0.24 (0.92) | −0.09 (0.71) |
10th - 11th grade | 42.0 | 42.1 | 48.0 | 46.0 | 45.5 | 0.36 (0.85) | −0.03 (0.64) |
≥ 12th grade | 23.5 | 21.9 | 24.5 | 21.0 | 22.7 | 0.29 (1.05) | 0.12 (0.84) |
Unknown | 1.2 | 0.9 | 2.9 | 1.0 | 2.3 | 0.06 (0.85) | −0.01 (0.77) |